Gardening know-how
Now if I said there is more to planting a tree than digging a hole and burying the root ball, you may think I am exaggerating. But planting methods do vary on the size of the tree and even the species. Small, bare root trees, only several years old, which have been grown and lifted from nursery beds are by far the simplest trees to plant by the notch method. That is, cut a notch with a spade or mattock and, while holding it open, slip the tree in and spread the roots. Make sure the root collar is level with the soil surface. The root collar is the part of the tree’s stem that was at ground level when it was growing in the nursery – the stem often changes colour at this point. Then tread the split closed with your foot and check that the tree is firmly planted with a gentle tug. Bare root trees of such a young age do transplant better than older stock, but will take longer to reach a size when most people perceive them as a mature tree. A tree over five foot (1.5m) tall should be regarded as a mature rootstock transplant and a full planting pit be dug out for the plant. Make sure the holes are large enough to take the entire root network. Mark out the positions of the holes if you are planting multiple numbers of trees over an area before digging commences, otherwise it is easy to end up with too many trees at one end of the site and too few at the other. For large trees, over 1.5m, including fruit trees and specimen trees, which include container grown trees, dig a hole three times as wide as the pot and the same depth. Loosen the soil around the hole with a fork and add a small amount of fertilizer to the planting pit and work well into the base. Thoroughly soak the root ball in water before planting – standing it in a bucket is good for this. Loosen the root ball to encourage roots to grow into the soil. Place the root ball in the hole so that the point where the roots meet the trunk is level with the surface of the soil surface. A piece of wood can be useful to check the level. Refill the hole ensuring there are no air pockets around the roots. Firm the soil around the tree making sure the stem remains upright. Use a tree guard or spiral if your garden has wildlife visitors who may want to nibble the bark. Add a length of 1’’ drainage pipe or specialist watering tubing around the root ball of the tree before backfilling, to allow watering in the summer months to reach down to the root area. Tree watering ‘bags’ are useful tools to use also, as they drip water to the tree but they do need topping up regularly. Add a 5-8cm (2-3in) layer of mulch but leave a 10cm (4in) mulch-free collar around the base of the stem. Watering of the tree should be a regular summer practice for the first two to three years of planting. After such an investment of planting trees of any size, giving the best start in life is essential to the success of the plant. There are many methods for tree staking and also specialist ground anchor systems on the market. There are two schools of thought when it comes to helping a tree to establish for the first number of years. Ground anchorage (cables running and securing the root ball underground) allows the tree to move and bend with the wind and allows micro fibrous roots to establish. While staking with support stakes is the traditional method and is quick to install. It is more suitable for some heavy standard trees (large trees) where some protection of the crown is required. The webbing these days is usually made of a flexible rubber belt type material to not mark the bark of the tree. The tying method needs to allow the tree to move and flex but also support, the bracing around the stem is a key point in that it needs to be loose enough to allow the tree to grow and put on girth without restricting the growth. This is the reasoning why the two or three stake method is employed on certain species to allow the tree to move in several directions as the wind blows. Stakes should be removed after several years of assisting the tree gain root mass. I have witnessed over the years where stakes are left in situ and forgotten with the result that the stake has lifted out of the ground as the tree has grown and the webbing has severely bitten into the tree’s inner core, causing damage to a specimen.
Peter Bradburn | Course and Grounds Manager | peter.bradburn@roehamptonclub.co.uk